#include <OneWire.h>
#include <DallasTemperature.h>
#include <Wire.h>
#include <LiquidCrystal.h>

// Pin configuration
const int oneWireBus = 3; // Digital pin for DS18B20
const int phPin = A1;     // Analog pin for pH (Potentiometer)
const int turbidityPin = A2; // Analog pin for Turbidity (LDR)

// Initialize the LCD library with the numbers of the interface pins
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

// Setup a OneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);
DallasTemperature sensors(&oneWire);

// Flag to check if the values have been read
bool hasExecuted = false;

void setup() {
  // Initialize the LCD and Serial Monitor
  lcd.begin(16, 2);
  lcd.print("Water Quality");
  Serial.begin(9600);

  // Start up the Dallas Temperature library
  sensors.begin();
}

void loop() {
  if (!hasExecuted) {
    // Request temperature from DS18B20
    sensors.requestTemperatures();
    float temperature = sensors.getTempCByIndex(0); // Get temperature in Celsius

    // Read pH value (from potentiometer)
    int phValue = analogRead(phPin); 
    float ph = map(phValue, 0, 1023, 0, 14); // Convert to pH range 0-14

    // Read turbidity value (from LDR)
    int turbidityValue = analogRead(turbidityPin); 
    float turbidity = map(turbidityValue, 0, 1023, 0, 100); // Convert to a scale from 0 to 100

    // Display values on LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("T:"); lcd.print(temperature, 1); lcd.print("C");
    lcd.setCursor(8, 0);
    lcd.print("pH:"); lcd.print(ph, 1);
    lcd.setCursor(0, 1);
    lcd.print("Turb:"); lcd.print(turbidity, 1);

    // Print values to Serial Monitor
    Serial.print("Temperature: ");
    Serial.print(temperature, 1);
    Serial.println(" C");

    Serial.print("pH: ");
    Serial.println(ph, 1);

    Serial.print("Turbidity: ");
    Serial.println(turbidity, 1);

    // Set the flag to true to indicate that execution is complete
    hasExecuted = true;
  }

  // Add a delay to avoid any rapid looping (optional)
  delay(1000); // Adjust as needed or remove if no further actions are needed
}